"I ran and got the machine. I've never run so fast in my entire life. I think I took two steps at at time," she said. "As soon as I opened it, the EMTs came in."

Emergency medics eventually took over and rushed Morrison to Atlanta Medical Center.

"I honestly thought that was the last moment I was going to see David, rolling out on that gurney," said co-worker Julie Marshall. "It is a true miracle that he is here with us today. And it's because of all these people that stepped up and did what they needed to do."

Their life-saving collaboration caught the attention of Delta executives, who were preparing to launch a new online CPR and AED training course.

A total of 7,000 employees worldwide have taken the course since the start of June.

"That's quite a spike, more than usual for a training course," said Rob Kight, Delta's Vice President of Global Human Resources and Labor Relations. "There's a lot of interest generated by David's story."

The company has also installed more AEDs, including on the third floor of the Atlanta General Offices, where Morrison and his colleagues have worked together for years.

"How do you feel about them now?" Leslie asked him.

"It's hard to put it into words without getting choked up," Morrison responded.

"Do they feel more like family?" she asked.

"Yes. I just don't know if I can invite them all over for dinner, he said with a laugh.

If you want to make sure your co-workers are prepared for a similar emergency, the American Red Cross will come out to do training on-site.